docs: add pytorch integration guide. #300

Job	Run time
Cargo Machete	1m 3s
determine changes	8s
pre-commit	43s
build binary \| linux x86_64	1m 59s
build binary \| windows aarch64	4m 4s
build binary \| macos aarch64	3m 40s
build binary \| macos x86_64	0s
build binary \| windows x86_64	3m 55s
cargo test \| ubuntu	4m 27s
cargo test \| macos aarch64	6m 40s
cargo test \| macos x86_64	0s
cargo test \| windows	7m 15s
cargo rustdoc \| ubuntu	56s
cargo clippy \| ubuntu	47s
cargo fmt \| ubuntu	14s
pytest integration \| linux x86_64	9m 0s
test wheel installation \| linux x86_64 / Test Installation of Common Wheels \| linux-x86_64	1m 50s
pytest integration \| macos aarch64	5m 11s
test wheel installation \| macos aarch64 / Test Installation of Common Wheels \| macos-aarch64	2m 34s
pytest integration \| windows x86_64	5m 55s
test wheel installation \| windows x86_64 / Test Installation of Common Wheels \| windows-x86_64	2m 57s
	1h 3m 18s

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